Editing Factorial cache

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Test case details

Title *

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

Obviously caching wins.

function factorial2(n) {
  factorial2.cache = factorial2.cache || [1];
  return factorial2.cache[n] || (factorial2.cache[n] = n * factorial2(n - 1));
}

function factorial3(n) {
  var res = 1;
  for (var i = 2; i <= n; ++i)
  res = res * i;
  return res;
}

function factorial4(n){
	var j = n;
	while (--j) {
		n *= j;
	}
	return n;
}

function factorial5(n){
	for (var j = n-1; j > 1; j--) {
		n *= j;
	}
	return n;
}
function factorial5b(n){
	for (var j = n; j > 1; --j) {
		n *= j;
	}
	return n;
}

function factorial5c(n){
	for (var j = n; j > 1; --j) {
		n = n * j;
	}
	return n;
}

var n;

</script>

<p>Do they work?</p>
<script>
// do they work?
n = 7;
document.write(
factorial(n) == factorial2(n) ? "YES" : "NO"
);
document.write(
factorial(n) == factorial3(n) ? "YES" : "NO"
);
document.write(
factorial(n) == factorial4(n) ? "YES" : "NO"
);
document.write(
factorial(n) == factorial5(n) ? "YES" : "NO"
);

</script>

Title

Async (check if this is an asynchronous test)

Code

factorial5_cache(n);